Thrifty Car Unable to provide invoice for additional Km traveled

Rented a polo vivo (FL32PRGP) with Thrifty from 04-07 October 2017 allocated a rental agreement number ********** . The first car that was allocated got a breakdown in Wolmaranstad on my way to Vryburg and it took 7 hours (15H00 -22H00) to get a replacement car. After that frustration I forgot to record the kilometres traveled on the previous car. On the 10/10/2017 my account was debited with R1746.62. I assumed that it was for additional km traveled. I then requested an invoice as that was a business trip and need record of such. I requested an invoice for that and non was forthcoming, instead on 02/11/2017, another R269.85 was debited from my account. I have been calling their head office on ********** and every time I am told that the invoice will be forwarded to my email. Thifty car rental seems to be ********.